One of the biggest mysteries surrounding the arrest of Nissan's former chairman Carlos Ghosn is over how he allegedly could have underreported his income by millions of dollars for years and why the company is going after the suspected wrongdoing now. Ghosn, who headed the Renault-Nissan-Mitsubishi Motors auto alliance, was arrested November 19 on suspicion he underreported his income by USD 44 million over five years, or about half of what he was really making...